Case 30.- Transposition of the inferior laterals, oligodontia of the upper laterals, macrodontia of the upper right central incisor and deviation of the skeletal midline in an 8 1/2-yr-old  boy, treated in various stages according to the following treatment plan: 
1. Maintaining the lower arch space.  2. Serial extractions of the dec.  laterals, lower first molars and lower canines, as well as upper canines (at different times).  3. Inferior fixed appliances to place the lateral incisors in position. 4. Extractions of the first lower premolars.  5. Alignment of the dental arches placing the cuspids in place of the laterals using Alexander type appliances (.018 gap)  6. Removal of the appliances and referral to her dentist for anatomical modifications of the canines and upper central incisors.